Flutter url_launcher未处理的异常:无法启动youtube url(由canLaunch引起)

问题描述

我正在尝试使用 url_launcher 插件通过链接打开youtube视频，但是 canLaunch 函数始终会引发错误.我只能通过完全删除 canLaunch 函数来绕过此错误，但无法弄清楚出了什么问题.

I'm trying to use the url_launcher plugin to open youtube videos by link but the canLaunch function keeps throwing an error. I'm able to bypass this error only by completely removing the canLaunch function but can't figure out what is wrong.

代码不起作用:

_goToVideo(YoutubeVideoData video) async {
  if (await canLaunch(video.url)) {
    await launch(video.url);
  } else {
    throw 'Could not launch ${video.url}';
  }
}

代码有效:

_goToVideo(YoutubeVideoData video) async {
  await launch(video.url);
}

我不太确定为什么我不能使用自述文件示例

I'm not quite sure why I can't use the canLaunch method as written in the README Example

错误:

E/flutter (12574): [ERROR:flutter/lib/ui/ui_dart_state.cc(166)] Unhandled Exception: Could not launch https://www.youtube.com/watch?v=-3g5WlqJtIo
E/flutter (12574): #0      _goToVideo (package:esfandapp/widgets/newsList/videoCard.dart:71:5)
E/flutter (12574): <asynchronous suspension>
E/flutter (12574): #1      VideoCard.build.<anonymous closure> (package:esfandapp/widgets/newsList/videoCard.dart:13:20)
E/flutter (12574): #2      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:992:19)
E/flutter (12574): #3      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:1098:38)
E/flutter (12574): #4      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:184:24)
E/flutter (12574): #5      TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:524:11)
E/flutter (12574): #6      BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:284:5)
E/flutter (12574): #7      BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:256:7)
E/flutter (12574): #8      GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:158:27)
E/flutter (12574): #9      GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:224:20)
E/flutter (12574): #10     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:200:22)
E/flutter (12574): #11     GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:158:7)
E/flutter (12574): #12     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:104:7)
E/flutter (12574): #13     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:88:7)
E/flutter (12574): #14     _rootRunUnary (dart:async/zone.dart:1206:13)
E/flutter (12574): #15     _CustomZone.runUnary (dart:async/zone.dart:1100:19)
E/flutter (12574): #16     _CustomZone.runUnaryGuarded (dart:async/zone.dart:1005:7)
E/flutter (12574): #17     _invoke1 (dart:ui/hooks.dart:267:10)
E/flutter (12574): #18     _dispatchPointerDataPacket (dart:ui/hooks.dart:176:5)

使用以下功能的小部件:

Widget using the function:

class VideoCard extends StatelessWidget {
  final YoutubeVideoData video;
  VideoCard({this.video});

  @override
  Widget build(BuildContext context) {
    return InkWell(
      onTap: () => _goToVideo(video),
      child: Container(
        child: Card(
          child: Container(
            child: Column(
              children: [
                Align(
                  child: Padding(
                    child: Text(
                      video.title,
                      style: TextStyle(
                        fontFamily: 'Roboto Condensed',
                        fontSize: 16,
                      ),
                    ),
                    padding: EdgeInsets.fromLTRB(15, 0, 15, 10),
                  ),
                  alignment: Alignment.centerLeft,
                ),
                Container(
                    child: Image.network(video.thumbnails[1], fit: BoxFit.cover,),
                  width: MediaQuery.of(context).size.width,
                ),
                Align(
                  child: Container(
                    child: Text(
                      video.date.toString() + "",
                      style: TextStyle(
                        fontFamily: 'Roboto Condensed',
                        fontSize: 14,
                        fontWeight: FontWeight.w300,
                      ),
                    ),
                    padding: EdgeInsets.fromLTRB(15, 5, 15, 0),
                  ),
                  alignment: Alignment.centerLeft,
                ),
              ],
            ),
            width: MediaQuery.of(context).size.width - 32,
            padding: EdgeInsets.symmetric(
              horizontal: 0,
              vertical: 10,
            ),
            alignment: Alignment.center,
          ),
          shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.all(Radius.circular(25))),
        ),
      ),
    );
  }
}

推荐答案

从API30(Android 11)开始，您的Android应用必须列出与之交互的所有应用.

Starting from API30 (Android 11), your Android app has to list all apps it interacts with.

您可以添加:

<uses-permission android:name="android.permission.QUERY_ALL_PACKAGES"/>

在您的Android清单中

绕过它或专门列出它们.

in your android manifest to bypass it or specifically list them.

有关更多信息: https://developer.android.com/about/versions/11/privacy/package-visibility

这篇关于Flutter url_launcher未处理的异常:无法启动youtube url(由canLaunch引起)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！